import numpy as np
#创建一个含有小数点四行四列的数组，名为data
data = np.array([[1.5,2.5,3.5,4.5],
                [5.5,6.5,7.5,8.5],
                 [9.5,10.5,11.5,12.5]
                 [13.5,14.5,15.5,16.5]])

#沿着纵向排序
data.sort(axis=0)

